Two chess experts carry on a chess game in their heads without a board or any pieces; they simply call out their moves to one another. Obviously, they are good at using

Over the last 50 years, membership in the American Psychological Association has

a. decreased. b. remained the same. c. increased dramatically. d. first increased and then decreased.

Tolerance and withdrawal are the hallmarks of substance ____

a. dependence b. consumption c. abuse d. use